Jobson, Adam S., and André E. Kézdy. “All Minor-Minimal Apex Obstructions With Connectivity Two”. The Electronic Journal of Combinatorics 28, no. 1 (January 29, 2021): P1.23. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v28i1p23.